Three decades of global methane sources and sinks
S. Kirschke,Philippe Bousquet,Philippe Ciais,Marielle Saunois,Josep G. Canadell,Edward J. Dlugokencky,Peter Bergamaschi,Daniel Bergmann,Donald R. Blake,Lori Bruhwiler,Philip Cameron-Smith,Simona Castaldi,Simona Castaldi,Frédéric Chevallier,Liang Feng,Annemarie Fraser,Martin Heimann,Elke L. Hodson,Sander Houweling,Béatrice Josse,Paul J. Fraser,Paul B. Krummel,Jean-Francois Lamarque,Ray L. Langenfelds,Corinne Le Quéré,Vaishali Naik,Simon O'Doherty,Paul I. Palmer,Isabelle Pison,David A. Plummer,Benjamin Poulter,Ronald G. Prinn,Matthew Rigby,Bruno Ringeval,Bruno Ringeval,Monia Santini,Martina Schmidt,Drew Shindell,Isobel J. Simpson,Renato Spahni,L. Paul Steele,Sarah A. Strode,Kengo Sudo,Sophie Szopa,Guido R. van der Werf,Apostolos Voulgarakis,Apostolos Voulgarakis,Michiel van Weele,Ray F. Weiss,J. E. Williams,Guang Zeng +50 more
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In this paper, the authors construct decadal budgets for methane sources and sinks between 1980 and 2010, using a combination of atmospheric measurements and results from chemical transport models, ecosystem models, climate chemistry models and inventories of anthropogenic emissions.Abstract:
Methane is an important greenhouse gas, responsible for about 20% of the warming induced by long-lived greenhouse gases since pre-industrial times. By reacting with hydroxyl radicals, methane reduces the oxidizing capacity of the atmosphere and generates ozone in the troposphere. Although most sources and sinks of methane have been identified, their relative contributions to atmospheric methane levels are highly uncertain. As such, the factors responsible for the observed stabilization of atmospheric methane levels in the early 2000s, and the renewed rise after 2006, remain unclear. Here, we construct decadal budgets for methane sources and sinks between 1980 and 2010, using a combination of atmospheric measurements and results from chemical transport models, ecosystem models, climate chemistry models and inventories of anthropogenic emissions. The resultant budgets suggest that data-driven approaches and ecosystem models overestimate total natural emissions. We build three contrasting emission scenarios-which differ in fossil fuel and microbial emissions-to explain the decadal variability in atmospheric methane levels detected, here and in previous studies, since 1985. Although uncertainties in emission trends do not allow definitive conclusions to be drawn, we show that the observed stabilization of methane levels between 1999 and 2006 can potentially be explained by decreasing-to-stable fossil fuel emissions, combined with stable-to-increasing microbial emissions. We show that a rise in natural wetland emissions and fossil fuel emissions probably accounts for the renewed increase in global methane levels after 2006, although the relative contribution of these two sources remains uncertain. © 2013 Macmillan Publishers Limited.read more
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Microbial communities involved in the methane cycle in the near-bottom water layer and sediments of the meromictic subarctic Lake Svetloe.
Vitaly V. Kadnikov,Alexander S Savvichev,Andrey V. Mardanov,Alexey V. Beletsky,Alexander Y. Merkel,Nikolai V. Ravin,Nikolai V. Pimenov +6 more
TL;DR: It is shown that the sediments of a subarctic meromictic lake contain a taxonomically and metabolically diverse community potentially capable of complete mineralization of organic matter.
Journal ArticleDOI
Automated simultaneous measurement of the δ13C and δ2H values of methane and the δ13C and δ18O values of carbon dioxide in flask air samples using a new multi cryo-trap/gas chromatography/isotope ratio mass spectrometry system
TL;DR: In this article, the authors present a new system for high-precision stable isotope measurements of carbon, hydrogen and oxygen in atmospheric methane and carbon dioxide, which is intended for analyzing flask air samples from existing sampling programs without the need for extra sample air for methane analysis.
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New Insights into the Ecology and Physiology of Methanomassiliicoccales from Terrestrial and Aquatic Environments.
Marc Cozannet,Guillaume Borrel,Erwan Roussel,Yann Moalic,Maxime Allioux,Amandine Sanvoisin,Laurent Toffin,Karine Alain +7 more
TL;DR: In this paper, a new species of the archaeal order Methanomassiliicoccus armoricus MXMAG1 has been proposed, which can produce methane by reduction of methyl compounds and dihydrogen oxidation.
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Radiocarbon isotope technique as a powerful tool in tracking anthropogenic emissions of carbonaceous air pollutants and greenhouse gases: A review
Gan Zhang,Gan Zhang,Junwen Liu,Jing Li,Jing Li,Pingyang Li,Pingyang Li,Nannan Wei,Nannan Wei,Nannan Wei,Buqing Xu,Buqing Xu +11 more
TL;DR: In this article, the authors reviewed the current knowledge of 14C in organic carbon (OC), elemental carbon (EC), individual organic compounds, methane (CH4), carbon dioxide (CO2), annual plants, and tree rings.
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Ground-level concentrations of atmospheric methane in southwest Greenland evaluated using open-path laser spectroscopy and cavity-enhanced absorption spectroscopy
TL;DR: In this article, the authors used a CH4 detecting OPL instrument at seven different field sites in southwest Greenland during the summer of 2012 to monitor atmospheric CH4 concentrations in the presence of local CH4 sources and sinks.
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